Intermediate — Day 5

# INSTRUCTOR — Day 5: AI-Assisted Customization (Intermediate)
# -----------------------------------------------
# TEACH: No new Python concepts today. Students use AI to extend their snake game.
# Your role: circulate and verify students understand generated code before using it.
# Ask: "What does this line do?" If they can't answer, send them back to the AI to ask.
#
# DEMO SEQUENCE (do this at the start before students work independently):
#   1. Paste the Day 4 snake code into the AI.
#   2. Prompt: "Add a score display to my snake game. Show the current score
#      at the top of the screen using a pen turtle."
#   3. Walk through every line of the generated code with the class.
#   4. Paste it in live and show it working.
#
# REFERENCE: complete snake game with all AI-assisted features added

import turtle
import time
import random

screen = turtle.Screen()
screen.title("Snake Game")
screen.bgcolor("black")
screen.setup(width=600, height=600)
screen.tracer(0)

head = turtle.Turtle()
head.shape("square")
head.color("white")
head.penup()
head.goto(0, 0)

food = turtle.Turtle()
food.shape("circle")
food.color("green")
food.penup()
food.goto(random.randint(-270, 270), random.randint(-270, 270))

# AI feature: score display
pen = turtle.Turtle()
pen.penup()
pen.hideturtle()
pen.color("white")
pen.goto(0, 270)

score = 0
high_score = 0

def update_score():
    pen.clear()
    pen.write("Score: " + str(score) + "  High: " + str(high_score),
              align="center", font=("Courier", 18, "bold"))

update_score()

bodysegments = []

# AI feature: speed scaling
currentspeed = 0.1

def got_food():
    global score, currentspeed
    food.goto(random.randint(-270, 270), random.randint(-270, 270))
    new_seg = head.clone()
    bodysegments.append(new_seg)
    score += 1
    currentspeed *= 0.95    # AI feature: speed up slightly on each eat
    update_score()

def go_up():
    if head.heading() != 270:
        head.setheading(90)

def go_down():
    if head.heading() != 90:
        head.setheading(270)

def go_left():
    if head.heading() != 0:
        head.setheading(180)

def go_right():
    if head.heading() != 180:
        head.setheading(0)

screen.listen()
screen.onkeypress(go_up,    "Up")
screen.onkeypress(go_down,  "Down")
screen.onkeypress(go_left,  "Left")
screen.onkeypress(go_right, "Right")

halfSize = 290

def reset_game():
    global score, currentspeed, high_score
    if score > high_score:
        high_score = score  # AI feature: high score persists across resets
    score = 0
    currentspeed = 0.1
    head.goto(0, 0)
    head.setheading(0)
    for seg in bodysegments:
        seg.hideturtle()
    bodysegments.clear()
    update_score()

# AI feature: bad food that resets the game
badfood = turtle.Turtle()
badfood.shape("circle")
badfood.color("red")
badfood.penup()
badfood.goto(random.randint(-270, 270), random.randint(-270, 270))

while True:
    screen.update()

    for i in range(len(bodysegments) - 1, 0, -1):
        bodysegments[i].goto(bodysegments[i - 1].pos())
        bodysegments[i].setheading(bodysegments[i - 1].heading())
    if len(bodysegments) > 0:
        bodysegments[0].goto(head.pos())
        bodysegments[0].setheading(head.heading())

    head.forward(20)

    if head.distance(food) < 20:
        got_food()

    if head.distance(badfood) < 20:    # bad food resets
        badfood.goto(random.randint(-270, 270), random.randint(-270, 270))
        reset_game()

    for seg in bodysegments:
        if head.distance(seg) < 15:
            reset_game()
            break

    if (head.xcor() > halfSize or head.xcor() < -halfSize or
            head.ycor() > halfSize or head.ycor() < -halfSize):
        reset_game()

    time.sleep(currentspeed)